
<template>
  <div class="app-container">
    <!--查询表单-->
    <el-card class="operate-container" shadow="never">
      <el-form :inline="true" class="demo-form-inline">

        <!-- 所属分类：级联下拉列表 -->
        <!-- 一级分类 -->
        <el-form-item label="课程类别">
          <el-form-item>
            <el-select
              v-model="searchObj.subjectParentId"
              placeholder="请选择"
              @change="subjectLevelOneChanged">
              <el-option
                v-for="subject in subjectList"
                :key="subject.id"
                :label="subject.title"
                :value="subject.id"/>
            </el-select>
          </el-form-item>

          <!-- 二级分类 -->
          <el-form-item label="-">
            <el-select v-model="searchObj.subjectId" placeholder="请选择">
              <el-option
                v-for="subject in subjectLevelTwoList"
                :key="subject.id"
                :label="subject.title"
                :value="subject.id"/>
            </el-select>
          </el-form-item>

        </el-form-item>

        <!-- 标题 -->
        <el-form-item label="标题">
          <el-input v-model="searchObj.title" placeholder="课程标题"/>
        </el-form-item>
        <!-- 讲师 -->
        <el-form-item label="讲师">
          <el-select
            v-model="searchObj.teacherId"
            placeholder="请选择讲师">
            <el-option
              v-for="teacher in teacherList"
              :key="teacher.id"
              :label="teacher.name"
              :value="teacher.id"/>
          </el-select>
        </el-form-item>

        <el-button type="primary" icon="el-icon-search" @click="listData()">查询</el-button>
        <el-button type="default" @click="resetData()">清空</el-button>
      </el-form>
    </el-card>

    <!-- 工具按钮 -->
    <el-card class="operate-container" shadow="never">
      <i class="el-icon-tickets" style="margin-top: 5px"></i>
      <span style="margin-top: 5px;margin-right: 1em">数据列表</span>
      <el-button class="btn-add" type="danger" plain @click="add()">添加</el-button>
    </el-card>

    <!-- 表格 -->
    <el-table :data="list" border stripe>
      <el-table-column label="#" width="50">
        <template v-slot="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column label="封面" width="200" align="center">
        <template v-slot="scope">
          <img :src="scope.row.cover" alt="scope.row.title" width="100%">
        </template>
      </el-table-column>
      <el-table-column label="课程信息">
        <template v-slot="scope">
          <a href="" style="color: #20a0ff">{{ scope.row.title }}</a>
          <p>
            分类： <span class="color1">{{ scope.row.subjectParentTitle }}</span> > <span class="color2">{{ scope.row.subjectTitle }}</span>
          </p>
          <p>
            课时：<span class="color1">{{ scope.row.lessonNum }}</span> <span class="color3">|</span>
            浏览：<span class="color1">{{ scope.row.viewCount }}</span> <span class="color3">|</span>
            付费学员：<span class="color1">{{ scope.row.buyCount }}</span>
          </p>
        </template>
      </el-table-column>
      <el-table-column label="讲师" width="100" align="center">
        <template v-slot="scope">
          {{ scope.row.teacherName }}
        </template>
      </el-table-column>
      <el-table-column label="价格(元)" width="100" align="center" >
        <template v-slot="scope">
          <el-tag v-if="Number(scope.row.price) === 0" type="success">免费</el-tag>

          <!-- 前端解决保留两位小数的问题 -->
          <!-- <el-tag v-else>{{ Number(scope.row.price).toFixed(2) }}</el-tag> -->

          <!-- 后端解决保留两位小数的问题，前端不用处理 -->
          <el-tag v-else>{{ scope.row.price }}</el-tag>
        </template>
      </el-table-column>
      <el-table-column prop="status" label="课程状态" width="100" align="center" >
        <template v-slot="scope">
          <el-tag :type="scope.row.status === 0 ? 'warning' : 'success'">{{ scope.row.status === 0 ? '未发布' : '已发布' }}</el-tag>
        </template>
      </el-table-column>
      <el-table-column label="发布时间" width="140" align="center">
        <template v-slot="scope">
          {{ scope.row.createTime ? scope.row.createTime.toString().substring(0, 10) : '' }}
        </template>
      </el-table-column>

      <el-table-column label="操作" width="210" align="center">
        <template v-slot="scope">
          <router-link :to="'/video/course/edit/'+scope.row.id">
            <el-button type="text" icon="el-icon-edit" >修改</el-button>
          </router-link>
          <router-link :to="'/video/course/chapter/'+scope.row.id">
            <el-button type="text" icon="el-icon-edit" >编辑大纲</el-button>
          </router-link>
          <router-link :to="'/video/course/chart/'+scope.row.id">
            <el-button type="text" icon="el-icon-edit">课程统计</el-button>
          </router-link>
          <el-button type="text" icon="el-icon-delete" @click="removeById(scope.row.id)" >删除</el-button>
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页组件 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[10, 20, 30, 40, 50, 100]"
      style="padding: 30px 0; text-align: center;"
      layout="total, sizes, prev, pager, next, jumper"
      @size-change="changePageSize"
      @current-change="changeCurrentPage"
    />
  </div>
</template>
<script>
import courseApi from '@/api/vid/course'
import teacherApi from "@/api/vid/teacher"
import subjectApi from "@/api/vid/subject"
export default {
  name: "list",
  data(){
    return {
      list: [], // 课程列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
      searchObj: {
        subjectId: ''// 解决查询表单无法选中二级类别
      }, // 查询条件
      teacherList: [], // 讲师列表
      subjectList: [], // 一级分类列表
      subjectLevelTwoList: [] // 二级分类列表,
    }
  },
  created() {
    this.listData()
    this.initTeacherList()
    this.initSubjectList()
  },
  methods:{
    listData(){
      courseApi.pageCourseList(this.page,this.limit,this.searchObj)
        .then(res => {
          this.list = res.data.list
          this.total = parseInt(res.data.total)
        })
    },
    subjectLevelOneChanged(value){
      subjectApi.getChildList(value).then(response => {
        this.subjectLevelTwoList = response.data
        this.searchObj.subjectId = ''
      })
    },
    initTeacherList() {
       teacherApi.pageList(1,10,{})
         .then(res => {
           this.teacherList = res.data.list
         })
    },
    initSubjectList() {
       subjectApi.getChildList(0)
         .then(res => {
             this.subjectList = res.data
          })
    },
    changePageSize(size) {
      this.limit = size
      this.listData()
    },
    changeCurrentPage(page){
      this.page = page
      this.listData()
    },
    add() {
      this.$router.push({path: '/video/course/add' })
    },
    removeById(id){
      this.$confirm('此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?','提示',{
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        courseApi.removeCourseById(id)
          .then(res => {
            this.$message.success('删除课程成功！')
            this.listData()
          })
      })
    },
    resetData() {
      this.searchObj = {}
      this.listData()
    }

  }
}
</script>

<style scoped lang="scss">
 .color1{
   color: #ff952f;
 }
 .color1{
   color: #ff511d;
 }
 .color3{
   color: #333;
 }
</style>
